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  4. In a cuboid of dimension 2 L × 2 L × L, a charge q is placed at the center of the surface ' S ' having area of 4 L 2. The flux through the opposite surface to ' S ' is given by

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Q. In a cuboid of dimension $2 L \times 2 L \times L$, a charge $q$ is placed at the center of the surface ' $S$ ' having area of $4 L ^2$. The flux through the opposite surface to ' $S$ ' is given by

JEE MainJEE Main 2023Electric Charges and Fields

Solution:

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Flux passing through shaded face $=\frac{ q }{6 \varepsilon_0}$